Biogas is produced by anaerobic digestion with anaerobic bacteria or fermentation of biodegradable materials such as manure, sewage, municipal waste, green waste, plant material, and crops. It is primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes
Biomethane is a gaseous fuel that contains >97% methane, and is produced from biogas generated through the anaerobic digestion of organic materials, or from landfill gas production. Biomethane is biogas that is cleaned by removing contaminants such as hydrogen sulphide and moisture. It can be used also in CNG vehicles
Liquefied natural gas (LNG) is natural gas (predominantly methane, CH4) that has been converted to liquid form for ease of storage or transport. Liquefied natural gas takes up about 1/600th the volume of natural gas in the gaseous state. It is odorless, colorless, non-toxic and non-corrosive. Hazards include flammability after vaporization into a gaseous state, freezing and asphyxia. LNG temperature is approximately −162 °C
Methane fuel gas is very high octane (up to 130) which allows it to function with high output in spark ignition engines (CNG, CBM, LNG, LBM). The result of combustion is carbon dioxide (CO2), water (H2O)